Size: 6-1/2 Design: Coaxial 2-Way Tweeter Design: 1-3/16' Balanced Dome Tweeter Composition: Polyethylene Terephthalate (PET) Woofer Composition: Injected Molded Polypropylene & trade; (IMPP) with MICA Woofer Surround: Rubber Coated Cloth Woofer Magnet Composition: Ferrite Max. Music Power (Nominal): 300W (40W) Frequency Response: 31 Hz to 18 k Hz Sensitivity (1W/1 m): 89 d B Impedance: 4 Ohms Mounting Depth: 1-3/4' (in.) Cut-Out Dimensions: 5' (in.)